Key to the species of the genus Rihirbus Stål 1861

1. Anterior pronotal lobe posteriorly without obtuse tuberculate, humeral angles of pronotum rounded, posterior pronotal lobe without distinct punctures and wrinkles, posterior pronotal margin nearly straight (Figs 1, 2)....................................................................................................... Rihirbus sinicus Hsiao & Ren

-. Anterior pronotal lobe posteriorly obtusely bi-tuberculated, humeral angles of pronotum more sharp, posterior pronotal lobe with distinct punctures and wrinkles, posterior pronotal margin convex (Figs 14, 15)......... Rihirbus trochantericus Stål